Need Help-4x4 frustation

RangerJ · Dec 13, 2017

I have a 1994 Ranger 4x4 manual tranmission,4x4 is push button on the dash.
I have replaced the 4x4 control module.dash switch,transfer case shift motor,and the pigtail in the dash behind the 4x4 switch. 4 high works everytime with no issues but 4 low has issues still,when I engage 4 low sometimes it works great and both the dash and switch light come on,then it is sometimes difficult to disengage,then later the dash light will not come on and it takes a while of pushing the dash switch to engage. And sometimes the 4low dash ( switch) light is on without 4x4 being engaged.Any help,advice will be appreaciated.Thanks

RonD · Dec 13, 2017

Reads like wiring, of course.

4low(manual trans) requires clutch pedal to be down all the way, Clutch switch closed.

Speed sensor, yes, 1994 has one on speedometer cable hookup, on transfer case, it needs to be working and showing 0MPH, this VSS sensor is also used for cruise control

I don't thing brake pedal needs to be down on Manual trans, only on automatics

These wires all go to the 4WD Control module, and need to be set or no shift to 4Low

I posted the 4WD wiring in this thread: http://www.therangerstation.com/forums/showthread.php?t=170637

1993 and 1994 are the same

RangerJ · Dec 13, 2017

Thanks Ron,I have noticed that the speedometer,will jump 70-80 mph while I am going 20-30 mph,that may be my problem

RonD · Dec 13, 2017

Speedometer in 1994 uses cable drive
VSS was just for computer, cruise and 4WD

Jumping cable drive speedo needle could be a broken wire on the cable, it catches and releases on the sheath while driving slow, at higher speed it can go away.

But could be worm gear on output shaft, maybe driven gear, but less likely

RangerJ · Dec 13, 2017

Thanks

Fordfreak11 · Dec 24, 2017

91 4x4 don't work

I just didn't swap to 4.0 everything works just fine. The only thing that don't is my 4x4. The harness from the 91 4.0 was 2wd auto but my truck is 91 4x4 5 speed. I fixed the wiring so my clutch pedal works correctly by wiring nss. But 4x4 don't work. There has to be away to find wires and make my 4x4 work again. I just am not having luck finding what wires go were. Or info on how to get it to work.

AzLizard · Dec 25, 2017

Cured mine of all that crap by swapping in a manual shift tcase.dash lights are the only thing that don't work.

Fordfreak11 · Dec 25, 2017

I might have to but I'd rather try to just wire it so that it all works right since I'm this close to having it stock again.

RonD · Dec 25, 2017

Happy Holidays

Did you download the wiring diagram for 1993 4WD PDF from the link I posted in #2 above?

If module has power with key on then when you select 4high module will send power to shift motor, if motor doesn't turn then 4WD light will flash indicating a problem.
If you are not getting the flashing light then module most likely doesn't have key on power

1994 and earlier module info here: http://www.therangerstation.com/tech_library/4wd_control_module.html

Shifting between 2WD and 4high, either way, doesn't require speed or clutch input, it is "shift on the fly" 4WD, so should work while driving or stopped
4low requires, 0MPH and clutch pedal down, also read a recent post that Parking brake needs to be on, but never heard of that before, but ONLY for 4Low

Need Help-4x4 frustation

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